Counterbalance for window-sashes.



G. I. L. LANGFORD. COUNTERBALANCE FOR WINDOW SASHES.

APPLICATION FILED SEPT-20, I915- Patented July 11, 1916.

5g 56 E x i E r03 v v GJLLCmg I O I CI igwwxwg BY @59 ATTORNEYS GEORGE JOHN LEON LANGFORD, OF INGERSOLL, ONTARIO, CANADA.

COUNTERBALANCE FOE VI'INDOlU-SASI-IES.

Application filed September 20, 1915.

To all whom it may concern Be it known that I, GEORGE J. L. LANG- ronn, a subject of the King of Great Britain, and a resident of Ingersoll, in the Province of Ontario and Dominion of Canada, have invented a new and Improved counterbalance for lVindow-Sashes, of which the following is a full, clear, and exact description.

My invention has for its object to provide a counter-balance for window sashes which has plates, each provided with a main sheave around which a sash cord is normally disposed the terminals of the cord being also disposed over additional sheaves and being secured one to each sash so that when a plate is disposed at each side of the window and the terminals of each of the cords are secured to the sashes, one sash will balance the other, the plates having grooves in which beads are normally disposed for separating the sashes.

Another object of the invention is to provide means for holding the main sheave yieldingly in position and also for securing the main sheave in position for adjustment, such adjustment being required to take up the slack of the sash cord which takes place after heavy sash have been hung for some time, due to the stretching of the cords.

Additional objects of the invention will appear in the following specification in which the preferred form of my invention is disclosed.

I11 the drawings similar reference characters refer to similar parts in all the views in which Figure 1 is a view showing in elevation a preferred form of the invention; Fig. 2 is a plan view of Fig. 1 and showing in section a window frame and sashes; Fig. 3 is a. fragmentary sectional view of sheave illustrated in Fig. 1. Fig. 4 is a view showing in elevation another modified form of the invention; Fig. 5 is a sectional elevation of Fig. 4; and Fig. 6 is a sectional view on the line 99 of Fig. 4.

By referring to the drawings it will be seen that a plate 33 is provided having a bent in portion forming a groove 39 in which a head, separating the sashes, is normally disposed. At each window two of these plates are provided, one on each side, each plate having sheave openings 37 with a bracket 36 disposed at the rear of each opening, the sheaves 35 being pivoted to the said brackets 36.

Specification of Letters Patent.

Patented July 11, 1916.

Serial No. 51,541.

In the drawings as illustrated in Figs. 1, 2 and 3 the main sheave 30 is pivoted at 31 to a bracket 32 the sides 32 of which serve to prevent the sash cord from leaving the sheave at the rear of the plate 33, a sash cord passing under the sheave 30 and then upward through the guards 36 over the sheaves 35 which are pivoted to the brackets 36 having the said guards 36 at the sheave openings 37 in the plate 33. In this way a complete circuit for the sash cord is provided which is securely guarded at every point making it impossible for the cord to jump off any of the sheaves through any retarded action of the sashes. The terminals of the sash cord 34 are secured one to each of the sashes 38 so that one sash will counter-balance the other and when one sash is raised, the other sash will be lowered. The plate 33 is provided with a bent in portion forming a groove 39 in which a head 40, separating the window sashes, is disposed. The plate 33 has an opening 23 in which the end of the rod 20 may be secured should it be desired to make use of the plate 33 with the rod and pulleys 21 which have been described.

In the construction illustrated in Figs. 4, 5 and (3 of the drawings, the plate 41 has two sheave openings 42 with combined brackets and sash cord guards 43 extending rearwardly from the plate 41 to which sheaves 44 are pivoted. U-shaped rims 45 unite the lower ends of the brackets 43 to form guideways for the springs 45 which are disposed around the screws 46 which mesh in threaded orifices 47 in the clamp 48, this clamp 48 having indents formed in the surface 49 for engaging the teeth 50 on the slide 51 which is mounted on the bent in portion 52 of the plate 41, the said bent in portion 52 acting as a guideway for the said slide. A combined bracket and sash cord guard 53 is carried by the slide 51 and pivoted to this bracket 53 there is a main sheave the main sheave 54 with combined bracket and cord guard 53 is forced upward on slide 51 to its highest point and locked by tightening the screws 46 which mesh in the threads tapped in the clamps 48 bringing the indents in the surface of said clamp 48 securely into mesh with the teeth 50 on the slide 51, thus holding the cord adjusting device perfectly rigid. Then when the weight of the sash has caused the sash cord to stretch so that when the lower sash is down to the bottom the upper one will be disposed a short distance from the top it is only necessary to put both sash to their home position and then loosen one of the screws 46 on each side of the window when the springs 45 will force back the clamp 48 leaving the slide free to be pulled down by the springs 58 when the adjustment will be automatic. Then the screws 46 are again made taut which entirely relieves the device from depending on any springs for its rigidity.

Having thus described my invention claim as new and desire to secure by Letters Patent:

1. In a counterbalance for window sashes, a plate having two openings and a guide, two sheaves, one pivoted adjacent each opening, a slide for moving on the guide, a third sheave pivoted to the slide, and resilient means for holding the slide yieldingly extended.

2. In a counter-balance for window sashes, a plate having a bent in portion forming a groove on its face and a guide on its rear, said plate having two openings, one at each side of the bent in portion, two sheaves, one pivoted adjacent each opening, a slide for moving on the guide, a third sheave pivoted to the slide, and resilient means for holding the slide yieldingly extended.

8. In a counter-balance for window sashes, a plate with orifices, two sheave openings and a guide, two sheaves, one pivoted adj acent each opening, a slide for moving on the guide, a third sheave pivoted to the slide, a clamp disposed across the slide and provided with threaded orifices, and screws disposed through the orifices in the plate and meshing with the threaded orifices in the clamp for pressing the clamp against the slide.

4. In a counter-balance for window sashes, a plate with orifices, two sheave openings, and a guide, two sheaves, one pivoted adj acent each opening, a slide for moving on the guide, a third sheave pivoted to the slide, a clamp disposed across the slide and provided with threaded orifices, screws disposed through the orifices in the plate and meshing with the threaded orifices in the clamp for pressing the clamp against the slide, and

springs for holding the clamp yieldingly away from the slide.

5. In a counter-balance for window sashes, a plate with two openings, brackets extending rearwardly from the plate at the sides of the openings, each pair of brackets being extended to form a U-shaped guide beyond the ends of the openings, two sheaves, one pivoted to each of the brackets, a guide on the plate, a slide for moving on the guide, a third sheave pivoted to the slide, there being orifices in the plate within the U-shaped guides, a clamp disposed across the slide and provided with threaded orifices, screws disposed through the orifices in the plate and meshing with the threaded orifices in the clamp for pressing against the slide, and springs disposed around the screws and within the U-shaped guides for holding the clamp yieldingly extended.

6. In a counter-balance for window sashes, a plate having two openings and a guide,

two sheaves, one pivoted adjacent each opening, a slide for moving on the guide, a bracket having a sash cord guard, a third sheave pivoted to the bracket and resilient means for holding the slide yieldingly extended.

7 In a counter balance for window sashes, a plate having two openings, brackets extending rearwardly from the plate at the sides of the openings, the sides of each bracket extending rearwardly and being united to form a sash cord guard, each pair of brackets being also extended to form a U- shaped guide at the lower ends of the openings, two sheaves, one pivoted to and between the sides of each bracket, a vertical guide on the plate, a slide for moving on the vertical guide and provided with teeth, a bracket having a sash cord guard mounted on the slide, a third sheave pivoted to the last mentioned bracket, there being orifices in the plate within the U-shaped guides, a clamp disposed across the slide and provided with indents for engaging the teeth on the slide, there being threaded orifices in the clamp, screws disposed through the orifices in the plate and meshing with the threaded orifices in the clamp for pressing the clamp against the slide, springs disposed around the screws and within the U-shaped guides for holding the clamp yieldingly extended and springs for holding the slide yieldingly in a predetermined position.

In testimony whereof I have signed my name to this specification in the presence of the two subscribing witnesses.

GEORGE JOHN LEON LANGFORD.

Witnesses:

H. E. HUTT, BLAKE A. Conoroor.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, I). 0. 

